Popularity Ranker re-ranks results obtained via TF-IDF Ranker using information about
the number of article views. The number of Wikipedia articles views is an open piece of information which can be
obtained via Wikimedia REST API.
We assigned a mean number of views for the period since 2017/11/05 to 2018/11/05 to each article in our
English Wikipedia database enwiki20180211.

The inner algorithm of Popularity Ranker is a Logistic Regression classifier based on 3 features:

Available information about Wikipedia articles popularity is downloaded to ~/.deeppavlov/downloads/odqa/popularities.json
and pre-trained logistic regression classifier is downloaded to ~/.deeppavlov/models/odqa/logreg_3features.joblib by default.